Gyrating sieve-bolter.



S. SNYDER.

GYRATING SIEVB BOLTBR.

APPLICATION FILED MAR.1Z,1910.

Patented June 21, 1910.

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GYRATING SIEVB BOLTEB.

APPLICATION mum 11.12, 1910.

961,814. Patented June 21, 1910.

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o. SNYDER.

GYBATING SIBVE BOLTEB.

APPLICATION FILED ml. 12, 1910.

Patented June 21, 1910.

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ANDREW I. 08M! 00.. mmmmmmmm WASHINGTON ma UNITED STATES PATENT OFFICE.

SIMON SNYDER, OF MUNCY. PENNSYLVANIA, ASSIGNOR TO SPROU'I, WALDRON & 00., OF MUNGY, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

GYRATING SIEVE-BOLTER.

Specification of Letters Patent.

Application filed March 12, 1910.

Patented J une21, 1910.

Serial No. 548,948.

To all whom it may concern:

Be it known that I, SIMON SN rnnn, a citizen of the United States, residing at Muncy, in the county of Lycoming and State of Pennsylvania, have invented certain new and useful Improvements in Gyrating Sieve- Bolters, of which the following is a specification.

This invention relates to driving mechanism for gyratory sifters or bolting machines of that type or class wherein the flexibly-suspended sieve-structure has a central vertically disposed drive-shaft coupled thereto and capable of a double universal motion between the power and sieve-structure so as to avoid or reduce excessive vibrations of the building in which the gyrator is located.

The objects of the invention are to provide improved means for imparting a gyratory movement to the sieve-structure and to increase the efliciency and durability of such machines, such means being designed and adapted to attain a perfect self-balance and smooth and even motion, and to prevent the jerking of the bolter on the mill building and the tendency to heat the bearings which is incident to the use of devices such as heretofore used for such purposes.

In prior machines of the type noted, gyratory motion has been produced either by crank or eccentric connections between the drive-shaft and sieve-structure, or by means of the centrifugal effect of an unbalanced load or weight adapted to deflect the shaft toward the weight. lVith this latter driving system, the momentum of the weight acts in the same direction as the momentum and throw of the sieve-structure, with consequent severe strains and wear on the driveshaft bearings and connections and a tendency to excessive gyration at high speed. A crank or eccentric drive, although capable of a balancing of the sieve-box, is also attended with certain mechanical disadvantages.

The machine which is the subject of this invention has an eccentrically sustained weight or load which by gravity throws the shaft out of plumb in a direction opposite or away from the load, so as to produce gyration of the sieve-structure while at the same time the force of the load offsets approximately the inertia or momentum of the defiected shaft and sieve-structure. This principle, establishing equilibrium, obliterates the. injurious effects of centrifugal force, avoids the objections above noted, and gives a drive which is believed to be mechanically perfect.

Certain other novel features of construc tion are also embraced in the invention, as will be hereinafter described and particularly pointed out in the claims at the end of this description.

In the accompanying drawings, which are to be taken as a part of this specification, Figure 1 represents a central vertical sectional elevation of a gyrating sieve-bolter embodying my invention. Fig. 2 is a Vertical sectional elevation, on an enlarged scale, of the lower bearing and parts below the sieve-structure shown in Fig. 1; portions of the sieve-structure and drive-shaft being broken away. Fig. 3 is a sectional View, also on an enlarged scale, of the suspension bearing shown in Fig. 1. Fig. 4 is a detail plan view, on a reduced scale. of the thrustlimiting device at the foot of the drive-shaft. Fig. 5 is a detail plan View, on a reduced scale, of the load-sustaining arm or weight carrier shown in Fig. 2 on a larger scale. Fig. 6 is a detail plan view, on a reduced scale, of a weight-carrier combined with a drive-pulley on the upper part of the shaft. Fig. 7 is a central vertical sectional elevation illustrating a modification of the con nections between the sievestructure and drive-shaft and of the suspension bearing and drive-pulley and connections at the upper end of the shaft; and Fig. 8 is a detail sectional view showing a plan of the universal joint or connection between the shaft and sieve-structure shown in section in Fig. 7

In said drawings, the numeral 1 may denote the floor of a mill building and 2 the ceiling.

33 may denote oppositely disposed sieveboxes, which may be built in one frame or joined by bridge-trees, according to any approved construction and which may constitute the gyratory sieve-structure freely sustained for gyration, being preferably suspended from the ceiling by resilient rods or reeds lit. The interior construction of the sieve-boxes, with their tiers of cloths or sieves and conduits for the several grades of flour or other stock, is not illustrated herein, since the same forms no part of my )resentinvention and any suitable and well known form may be employed. A centrallydisposed drive shaft 5 having on its upper portion or end a pulley 6 for the applicat on of power, (as by means of a belt running over suitable idlers from a drive-shaft below the mill floor or overhead), is suspended with capacity for universal pivotal or swinging motion and is loosely mounted in or connected to the sieve-structure for like motion relative thereto. In the illustrated embodiments of the invention, this double universal motion is afforded by ball-and-socketlike or universal bearings, and while the novel constructions shown are preferred, they are not to be taken as essential to or restrictive of the invention in its broader aspects.

In Fig. 1 the shaft 5 is supended from a substantially semi globular or half ballshaped bearing member 8 which in turn is seated in a socket-member or cup 9 integral or rigid with the hanger 10, depending from the ceiling as a housing through which the drive-shaft 5 extends. A suitable bushing or lining 11, of metal adapted for wear, is desirably fitted in the socket member to receive the correspondingly shaped bearing surface of the bearing member 8. The shaft 5 extends through and is rotatably fitted or journaled in the member 8 and may be sustained therein by a cap, collar or nut 12 fixed on the upper end of said shaft. Between the bearing member 8 and said cap 12 I preferably place a ball bearing comprising a pair of bearing plates 13 and an annular series of balls or anti-friction devices 14 running in annular grooves or ball races in the confronting surfaces of said bearing plates so as to )rovide a thrust-bearing to support the sha t and permit its free rotation in the half-ball bearing member 8, while the latter is adapted to rock and permit a gvra-ting movement of the shaft, that is, to allow the shaft while rotatin to revolve in a conical path due to the deflecting agency of the load hereinafter mentioned. It will be observed that the ball-like member 8 does not essentially partake of the pure rotation of the shaft. The pulley 6 is preferably a basket pulley formed or provided with a cup or vessel 15 to inclose the hanger and contain oil for lubrication, which can flow through apertures in the hanger into the cup or socket member of the bearing. The hub 16 of the pulley is provided with a stufiingbox 17 to prevent leakage of the lubricant down the shaft.

A somewhat similar bearing to that above described may be provided for the shaft in. the sieve-structure. As shown in Figs. 1 and 2 of the drawings, the shaft 5 is rotatably fitted or journaled in a rocking-member 18 of a universal joint or bearing, said rocking-member being seated in a socketmember composed of upper and lower separable parts 19 and 20 having interior concave surfaces to receive the convex surface of said rocking-member. The part 19 of said socket-member may have a cylindrical portion extending upwardly around a cylindrical upward extension of the rockingmember 18 and suitably capped to provide a closed receptacle for oil, while the part 20 may have :1 depending cylindrical portion formed or provided with an annular lateral flange for attachment to the bottom of the sieve-structure by bolts or other suitable fastenings. The closure for the oil-cup in the part 19 of the bearing member may c011- sist of a pair of metal plates and interposed packing disks on the shaft 5, the lower flanged plate being seated on the upper end of the cylindrical projection of the part 19 and having an enlarged opening therein to allow the shaft to move or swing around its vertical axis without touching the fixed plate, while the upper metal plate and the interposed packing disks rest upon the fixed plate and are adapted to slide on the latter so as to effectually close the opening therein and preventthe escape of oil. The bearingmember 18 is also preferably provided with a downwardly extending cylindrical portion which is surrounded by an oil-cup 21 having a hub portion provided with a suitable stufi ing-box on the shaft to prevent the leakage of oil.

Relative movement of the shaft and sievestructure in a direction corresponding to the axis of the latter is permitted by the described connection between said parts, which allows the rocking-member 18 to move up and down on the shaft sufficiently to permit the shaft to change its position from the perpendicular to any part of the circle of its travel when in motion, and in order that said rocking-member may not be obstructed or limited in its movements by any part of the oil cup or of the socket-member or casting that holds the rocking-member, the oil cup is adjustably secured on the shaft, as by means of a set screw, so that it can be easily adjusted up or down to give it any amount of clearance required.

There is no need for anti-friction devices between the members of the ball-and-socketlike bearing within or between the sections of the sieve-structure, since there is no longitudinal or axial thrust, it being remembered that the sieve-structure is sustained independently of the shaft. This sievebox hearing likewise allows pure rotation of the shaft in the ball-like member 18, while the latter can rock to accommodate itself to the universal pivotal or swaying motion of the shaft relative to the sieve-structure.

The shaft 5 freely rotating in the upper and lower bearings as described, carries preferably below the sieve-structure an eccentrically-supported load or weight 26 which as shown is mounted on a laterally projecting arm or weight-carrier 27 having a hub or socket fitted on the shaft and secured in a fixed position thereon by a set screw or other suitable means. The weight of this load will throw the shaft out of plumb, and with it displace the suspended sieve-structure laterally. The displacement is away from the load, or to the opposite side of the axis of revolution; it being noted in this connection that the load will be revolved by the rotation of the shaft and will itself cause revolution of the shaft about the same axis, thus producing a gyratory movement of the sievestructure. For regulating the load or varying the weight thereof, it may consist of in tel-changeable metallic plates or disks lying one upon another and secured together and to the weight-carrier by a bolt or bolts 28 passing therethrough and through an elongated slot or slots 29 (Fig. 5) in the weightcarrier, permitting a very nice adjustment of the load, which must be shifted very accurately. To this end the lowermost weightor metallic plate resting on the weight-carrier may be provided on the under side thereof with V-shaped grooves fitting over and slidable upon correspondingly shaped ribs or tracks 29 on the weight-carrier. Said lowermost Weight may also be formed or provided with interiorly threaded lugs or sockets engaging the screw-threads of an adjusting screw 30, the outer end of which is square or polygonal for the application of a socket-wrench thereto, for turning it, and the inner end thereof is swiveled to a lug on the weight-carrier, so that by turning the screw the weight or weights on the carrier may be moved in or out, and after ad justment they are held firmly in position by the bolts 28, said bolts being adapted to slide along the slots in the weight-carrier to permit the desired adjustment.

It will be observed that the drive-shaft is normally inclined while the axis of the sievestructure is normally vertical, and that relative movement of the shaft and sieve-struc ture in a direction corresponding to the axis of the sievestructure is permitted by the intermediate connections, the lower end of the shaft being disconnected and free to move or swing in a circle described by the thrust-limiting flange, and furthermore, that the direction of inclination of the shaft is opposite or away from the load, both normally and during rotation, hence equilibrium is established initially and maintained during rotation, thus avoidin the jerking and irregular movements 0 the sifter, with consequent vibrations and injury to the mill building, which are due to the action of centrifugal force on eccentrically-sustained or gyratory Weights as heretofore used, or proposed to be used, in

machines of this class as heretofore constructed.

For cooperation with the independently sustained sieve-structure and suspended normally inclined drive-shaft with upper and lower universal bearings and eccentricallysustained weight below the sieve-structure, for holding the shaft inclined. as described, and especially for use in buildings of weak construction, or which are very sensitive to vibration, I preferably employ an auxiliary weight-carrier or load above the sieve-structure, and in this instance I have combined with the drive-pulley a series of weights consisting of metal plates 1V secured by bolts to the web of the pulley 6, as shown in Figs. 1, 3 and 6 of the drawings. The weight of this load varies in different sized machines, about 12 or 15 pounds being desirable for a large sized machine. As will be seen, this load 1V is eccentrically supported on the drive-pulley which serves also as a weight-carrier extending in the same direction as the lateral arm or weight-carrier 27.

In order that the machine may not wabble in starting or stopping, it is desirable to use an underneath controlling device, and to this end there is secured on the lower end of the shaft a short arm 31, extending in the same direction as the arm or carrier 27 and having a depending loaded stud or short shaftsection 32 which is designed to hang at or coaxially with the center of revolution, for the purpose of steadying the motion. The load 33 on said stud 32 may comprise a plurality of annular disks which are shown held on a flanged thimble 34 having a fastening nut 35, said thimble being secured upon the stud or short shaft-section 32 be tween a shoulder thereon and a nut or capplate fixed on the lower end of the stud. The load 33 is encircled by a thrust-limiting flange 36 which is supported on a vertical shaft 37, having a step-bearing 38 in a pedestal 39, so that the flange 36 can turn freely with the load 33 when engaged thereby, so as to eliminate or reduce friction to a mini-.

mum. Shaft 37 is concentric with the axis of revolution of the deflected and eccentrically-loaded drive-shaft. The thrust-limiting flange is preferably provided with a lining an, of leather or other suitable material and bulged at one or more points by contact with a lug or protuberance X 011 the interior of the thrust-limiting flange, so as to facilitate rotation of the latter by contact of the loaded stud or short-shaft-section with the bulged portion of the flexible lining. For convenience in oiling the bearing within the sieve-structure I may provide a cup 0 havin a tube extending through an aperture in t e part 20 of the bearing and communicating with a duct in the ball-like bearing-member 18.

The operation of my invention will be understood from the foregoing description when taken in connection with the accompanying drawings. On applying power to the pulley G, the drive-shaft. is given pure rotation in its journals 8 and 18, thereby revolving the arms '27 and 31 carrying the loads '26 and 33. Since the shaft is inclined by the load 26 through action of gravity the shaft; is also caused to revolve about a vertical axis between it and the load, thus swinging around in av conical path and producing gyratiml of the sieve-strncture. the. universal joint or balland-socket-like bearings S and 18 adapting the shaft to its necessary pivotal motions relative to its suspension and the sieve-structure. Since the axis of motion lies between the drive-shaft and its displacing load. it follows that the centrifugal force of the load will oppose and offset approximately the centrifugal force of the deflected shaft plus the inertia of the sieve-structure, so that the machine will be in balance, the extent of gyration uniform, and the motion smooth and even. These latter effects are further promoted by the auxiliary load 1V and the steadying load 33, hung at the lower end of the shaft at the center of revolution; the load 26 being so adjusted that the said center or axis will coincide with the centers of the bearing member 8 and shafts 32 and 37, so that the loaded shaft or stud 32 will assume pure rotation only and thus operate as a crankpin or axle for the arm 81 which thus becomes a crank-arm. It is noted, however, that there is no connection between the shafts 32 and 37, so that this so-called crankarm is free and proper centering is attained solely by adjustment of the weights; although the broad. principles and scope of this invention do not exclude a. connection between shafts 32 and 37, or substitution for the free loaded crank-pin of a fixed crank-pin or axle or other steadying agency to confine the motion to a constant axis.

The machine illustrated in Fi 's. 7 and S of the drawings is essentially tlie same as described with reference to Figs. 1 to 6 inclusive, except a lnOdlfiCtltlOll of the sievestructure and universal joint or connections between the sieve-structure and drive-shaft. Instead of the ball-and-socket-like bearing within or between the oppositely disposed sieve-boxes or sections, as in Fig. 1, a universal joint of the gimbal type is substituted and arranged below the sieve-structure. In this instance the suspended drive-shaft is fitted or journaled in a sleeve 40 having articulation on two axes at right angles to each other; the sleeve 40 being sustained by set screws or pins 41 in a ring 42, which latter is sustained by set screws or pins 43 in brackets 44 attached to the bottom of the sieve-structure, said set screws having suitable lock-nuts thereon for securing them in fixed positions. The suspension bearing shown in Fig. 7 in full lines may be the same as that shown in Figs. 1 and 3 or any suitable construction. The power trans mission belt in Fig. T is shown running from a pulley (3 over idlers to a suitable driving-shaft or pulley, not. shown, but which may be located either below the mill floor or overhead, as desired. ()ne advantage of the construction illustrated in Fig. 7 is that the sieve-boxes 3 can be placed closer together. as the space required for the bearing used in Fig. .1, is iuulecessary. Such constrmrtion is preferable where room or space is limited.

It will be understood of course that while. I have herein shown and described a preferred embodiment of the invention, and one which will operate effectively in the attainment of the ends in view. the invention is not restricted to the specific form or construction shown or described, and that various changes in the details and arrangement of parts may be made without departing from the spirit and scope of my invention. I am a are however of the patents to 1V. V. Beaumont. No. 526,213. dated Sept. 18. 1894, H. O. Bowsman, No. 813,067, dated Feb. 5, 1907. and T. 1V. Graham, No. 865,346. dated Sept. 3, 1907, and do not desire to be understood as claiming herein any of the devices or combinations exhibited in said patents. The invention may also be used generally wherever it is desired to impart gyratory motion to any movable body or structure supported so as to be capable of gyration, as machines for sorting or sizing grain. ore coal, etc.; wherefore the term sieve-structure as used in this specification and claims appended hereto is to be construed to include any structure or machine to which the invention may be applied.

Having thus described my inventiolnwhat I claim as new and desire to secure by Letters Patent of the United States is:

1. In a gyrating machine, the combination with a sieve-structure freely-sup orted for gyration. of a suspended norma ly inclined drive-shaft rotatably-connected therewith, said shaft capable of a double universal pivotal motion relative to its suspension and the sieve-structure, the aforesaid connections permitting relative movement of the shaft and sieve-structure in a direction corresponding to the axis of the sievestructure, and an eccentrically-sustained load attached laterally on and revoluble by said shaft and by gravity displacing the shaft to the opposite side of the axis of revolution, so as to produce gyration of and at the same time balance the sieve-structure.

2. In a gyrating machine, the combination with a sievestructure freely-supported for gyration, of a normally inclined driveshaft connected with the sieve-structure by a universal-rocking swivel joint permitting relative movement of the shaft and sieve structure in a direction corresponding to the axis of the sieve-structure, said shaftrevoluble about a vertical axis, and a load on said shaft diametrically-opposite the direction in which the shaft is inclined, said load revoluble about the same axis and adapted to sustain the shaft in its inclined position and maintain the sieve-structure in balance.

3. In a gyrating machine, the combination with a sieve-structure freely-supported for gyration, of a rotary normally inclined drive-shaft journaled in and suspended from a bearing capable of a universal rocking motion, a bearing in said sievestructure in which said shaft is journaled with capacity for a universal rocking motion, a drive-pulley on the shaft, and a weight or load supported laterally on the shaft and by gravity throwing it out of plumb and maintaining its inclined position so as to produce gyration and at the same time balance the sieve-structure, the connections between the shaft and sieve-structure permitting relative movement in a direction corresponding to the axis of the sieve-structure.

4. In a gyrating machine, the combination with a sieve-structure freely-supported for gyration, of a drive-shaft suspended for universal pivotal motion, said shaft having a universal rocking journal in the sievestructure, a load supported eccentrically by said shaft and by gravity throwing the shaft out of plumb so as to cause it to revolve about an axis between the shaft and load, and a crank-arm on the lower end of said shaft sustaining a steadying load at or concentric with said axis of revolution.

5. In a gyrat-ing machine, the combination with a sieve-structure freely-supported for gyration, of a. suspended normally inclined drive-shaft rotatably-connected thereto, said shaft capable of a double universal swinging motion relative to its suspension and the sieve-structure, a load supported laterally on and revoluble by said shaft and by gravity displacing said shaft from its axis of revolution which lies between the centers of the shaft and load, and steadying means connected to the lower end of said shaft and adapted to maintain it in fixed relation to its center of revolution.

6. In a gyrating machine, the combination with a sieve-structure freely-supported for gyration, of an eccentrically-loaded drive-shaft loosely connected to said sievestructure, said shaft revoluble about an axis between it and its load, and a steadying load or weight supported below the sievestructure at or concentric with the axis of revolution of said eccentrically-loaded shaft.

7. In a gyrating machine, the combination with a sieve-structure freely supported for gyration, of an eccentrically-loaded driveshaft loosely connected to said sieve-structure, said shaft revoluble about an axis be tween it and its load, and a crank-arm on the lower end of the shaft having a free loaded crank-pin at or concentric with the axis of revolution.

S. In a gyrating machine, the combination with a sieve structure freely-supported for gyration, of an eccentrically-loaded driveshaft loosely connected to said sieve-structure, said shaft revoluble about an axis be tween it and its load, and a crank-arm on the lower end of the shaft having a free loaded crank-pin depending in or concentric with theaxis of revolution, and a revoluble thrust-limiting flange encircling said loaded crank-pin.

9. In a gyrating machine, the combination with a sieve-structure freely-sustained for gyration, of a normally inclined drive-shaft loosely mounted in the sieve-structure, gravity-actuated means deflecting the shaft from its axis of revolution to produce gyration, a crank-arm on the lower end of the shaft having a depending stud concentric with the axis of revolution, and a lower vertical shaft also concentric with the axis of revolution and having a thrust-limiting flange surrounding said stud.

10. In a gyrating machine, the combination with a sieve-structure freely sustained for gyration, of a suspended normally inclined drive-shaft passed freely through said sieve-structure, a bearing-member in which the upper end of said shaft is journaled, a socket in which said bearing member is seated, a swivel connection between said shaft and sieve-structure allowing a universal rocking motion of the shaft and permitting relative movement of the shaft and sieve-structure, and gravity actuated means on said shaft for throwing it normally and sustaining it continuously out of plumb.

11. In a gyrating machine, a flexibly suspended sieve-structure, in combination with a suspended, normally inclined drive-shaft extending through said sieve-structure, means connecting the shaft and sieve-structure so as to permit relative movement thereof, a weight-carrier projecting from said shaft below said sieve-structure and having a load thereon for holding the shaft normally inclined therefrom, together with a weight-carrier projecting from said shaft above said sieve-structure in line with the underneath carrier and cooperating with the latter for holding the shaft in its normally inclined position and adapting it to revolve about an axis between it and said first mentioned load.

12. In a gyrating machine, the combination with a sieve-structure freely-supported for gyration, of an eccentrically-loaded drive-shaft loosely connected to said sievestructure, said shaft revoluble about an axis between it and its load, a shaft-section or stud on the lower end of said inclined shaft concentric with its axis of revolution, and an underneath shaft-section also concentric with said axis of revolution carrying a thrust-limiting flange surrounding said stud and having an interior flexible lining with a protuberance on the inner side of the flange.

13. In a gyrating machine, the combination with a sieve-structure freely-sustained for gyration, of a suspended normally inclined drive-shaft passed freely through said sievestructure and carrying below the same an eccentrically attached weight, a bearing member in which the upper end of said shaft is journaled, a socket member in which said bearing-member is seated, and a similar journal for said shaft in the sievestructure, permitting relative movement of the shaft and sieve-structure.

14. In a gyrating machine, the combination with a sieve-structure freely-sustained for gyration, of a suspended drive-shaft, a bearlng-member in which said shaft is journaled, a socket member for said bearing member, a cap on the shaft, and an antifriction thrust-bearing between said bearing-member and cap whereby the shaft is suspended for free rotation in said bearingmember while the latter is free to rock universally to allow deflection of the shaft.

15. In combination, a flexibly suspended sieve-structure, an eccentric suspended drive-shaft, a swivel connection between said sieve-structure and said drive-shaft permitting relative movement in a direction corresponding to the axis of the sieve-structure, and gravity-actuated means on said shaft balancing the sieve-structure and sustainin the shaft in its eccentric position, adapting the shaft to revolve about an axis between it and its sustaining means so as to produce a gyratory movement of the sievestructure.

16. In combination, a flexibly suspended sieve-structure, an eccentric drive-shaft, suspended from above and extending through said sieve-structure, a swivel connection between said sieve-structure and drive-shaft permitting relative movement, and an eccentrically-attached weight adapted to sustain said shaft in its eccentric position and balance the sieve-structure, causing the shaft to revolve about an axis between it and said weight.

17. In a bolster, a sieve-structure freely suspended for gyration, a normally inclined drive-shaft extending through and having a flexible connection with said sieve-structure permitting relative movement, and gravityactuated means carried by and revoluble with the shaft holding it inclined from said means in a direction opposed to the action of centrifugal force, and balancing the sieve structure, thus causing the shaft to revolve about and swing around an axis between it and said means, for imparting a gyratory movement to said. sieve-structure.

18. Ina bolster, a sieve-structure freely suspended for gyration, a normally inclined drive-shaft suspended from above, extending through, and having a flexible connection with, said sieve-structure permitting relative movement, and gravity-actuated means eccentrically arranged on said shaft and revolubletherewith sustaining it in said inclined position and balancing the sievestructure, the direction of inclination of the shaft being away from said means and opposed to the action of centrifugal force, adapting the shaft to revolve about and swing around an axis between it and said sustaining and balancing means, for imparting a gyratory movement to said sievestructure.

19. In abolster, a sieve-structure freely suspended for gyration, a normally inclined drive-shaft suspended from above and extending through said sieve-structure and having a flexible connection therewith permitting relative movement, and gravity-actuated means eccentrically arranged on said shaft and revoluble therewith adapted to hold the shaft continuously inclined in a direction away from its sustaining means and opposed to the action of centrifugal force, while revolving about an axis between it and its sustaining means, thus imparting a gyratory movement to the sieve-structure.

20. In abolster, a sieve-structure freely suspended for gyration, a suspended driveshaft extending through said sieve-structure and having a connection therewith permitting both a swinging and a rotary movement of the shaft and relative movement of the shaft and sieve-structure, and gravity-actuated means below the sieve-structure holding said shaft normally and continuously during rotation inclined in a direction opposed to the tendency of centrifugal force acting through said means, whereby the shaft is caused to revolve about and swing around an axis between it and said means, for imparting a gyratory movement to said sievestructure.

21. In abolster, a sieve-structure freely suspended for gyration, a suspended normally inclined drive-shaft, a rocking bearing above said sieve-structure from whlch said shaft is suspended, a second bearing for said shaft carried by the sieve-structure permitting a rocking movement of the shaft and relative movement of the shaft and sieve-structure, and gravity-actuated means below the sievestructure eccentrically arranged on and revoluble with said shaft for holding it inclined Correction in Letters Patent N0. 9 61,t.-+.

in a direction away from said means and opposed to the action of centrifugal force, thereby causing the shaft to revolve about an axis between it and said means, for imparting a gyratory movement to the sievestructure.

22. In a gyrating machine, a flexibly suspended sieve-structure having its axis normally vertical, in combination with a suspended, normally inclined drive-shaft extending through the sieve-structure, means on said shaft for sustaining it in its normally inclined position, and means connecting the shaft and sieve-structure adapted to permit relative movement.

23. In a gyrating machine, a suspended normally inclined drive-shaft and a suspended sieve-structure through Which said shaft passes having its axis normally vertical, said sieve-structure being sustained independently of saidshaft and movable relain Gyrating Sieve-Bolters,

should read hotter,

tion therein that the same may [SEAL] It is hereby certified that in Letters Patent No. 961,814, granted upon the application of Simon Snyder, of Muncy,

correction as follows: Page 6, lines 60.,

tively thereto, and a weight on the shaft holding it normally inclined therefrom.

24. In combination, a flexibly suspended sieve structure havin its axis normally vertical, a suspended drive-shaft extending through said sieve-structure and carrying an eccentrieally supported Weight holding it normally inclined, adapting the shaft to revolve about an axis between it and the weight, a vertical shaft-section or stud at the foot of said inclined shaft concentric with its axis of revolution, and a thrust-limiting device encircling said shaft-section and revoluble on an axis concentric therewith.

In testimony whereof I afiix my signature, in presence of two witnesses.

SIMON SNYDER.

Witnesses:

T. M. SPRoU'r, STEPHEN SOARS.

June 21, 1910,

Pennsylvania, for an improvement an error appears in the printed specification requiring 73, 90, 104, and 120, the word bolster and that the said Letters Patent should be read with this correcconform to the record of case in the Patent Office.

Signed and sealed this 12th day of July, A. D., 1910.

c. c. BILLINGS,

Acting Commissioner of Patents. I

Correction in Letters Patent N0. 9 61,t.-+.

in a direction away from said means and opposed to the action of centrifugal force, thereby causing the shaft to revolve about an axis between it and said means, for imparting a gyratory movement to the sievestructure.

22. In a gyrating machine, a flexibly suspended sieve-structure having its axis normally vertical, in combination with a suspended, normally inclined drive-shaft extending through the sieve-structure, means on said shaft for sustaining it in its normally inclined position, and means connecting the shaft and sieve-structure adapted to permit relative movement.

23. In a gyrating machine, a suspended normally inclined drive-shaft and a suspended sieve-structure through Which said shaft passes having its axis normally vertical, said sieve-structure being sustained independently of saidshaft and movable relain Gyrating Sieve-Bolters,

should read hotter,

tion therein that the same may [SEAL] It is hereby certified that in Letters Patent No. 961,814, granted upon the application of Simon Snyder, of Muncy,

correction as follows: Page 6, lines 60.,

tively thereto, and a weight on the shaft holding it normally inclined therefrom.

24. In combination, a flexibly suspended sieve structure havin its axis normally vertical, a suspended drive-shaft extending through said sieve-structure and carrying an eccentrieally supported Weight holding it normally inclined, adapting the shaft to revolve about an axis between it and the weight, a vertical shaft-section or stud at the foot of said inclined shaft concentric with its axis of revolution, and a thrust-limiting device encircling said shaft-section and revoluble on an axis concentric therewith.

In testimony whereof I afiix my signature, in presence of two witnesses.

SIMON SNYDER.

Witnesses:

T. M. SPRoU'r, STEPHEN SOARS.

June 21, 1910,

Pennsylvania, for an improvement an error appears in the printed specification requiring 73, 90, 104, and 120, the word bolster and that the said Letters Patent should be read with this correcconform to the record of case in the Patent Office.

Signed and sealed this 12th day of July, A. D., 1910.

c. c. BILLINGS,

Acting Commissioner of Patents. I

Correction In Letters Patent No. 9 6l,t.-r.

1 'l." f I d It is hereby certified that in Letters Patent No. 961,814, granted June 21, 1910, upon the application of Simon Snyder, of Muney, Pennsylvania, for an improvement in Gyrating Sievellolters, an error appears in the printed specification requiring correction as follows: Page ii, lines 60, 73, 91), 1H1, and 120, the word holster should read boiler; and that the said Letters Patent should he read with this (t0l'I6(- tion therein that the mine may conform to the record of ease in the Patent ()llivv.

Signed and sealed this 12th day of July, A. l)., 1910.

[SEAL] (J. (1. Bl LLINGS,

Act/11g (19mm Z-ssimim' 0 1 intents. 

